Vladimir V. Saveljev

MoirÉ Minimization Condition in Three-Dimensional Image Displays

A moirÉ minimization condition is found analytically for the contact-type three-dimensional (3-D) imaging systems by approximating 3-D displays as four superposed sine gratings. Finding maximization conditions for two-dimensional (2-D) waves in this structure provides minimization of moirÉs. The global extremum was found at a certain angle which does not depend on the period. Experiments confirm the analytical findings. Practical advantage of using that angle is in its wide areas of applications: 3-D displays can be made to have almost invisible moirÉs with using this angle without regards to other specific parameters like pixel size and pitch of the screen.

About a MoirÉ-Less Condition for Non-Square Grids

The moire-less condition is found for non-square grids. The exact solution is found in form of a quartic equation depending on the geometric parameter. The root gives the optimal angle for minimized moires. The approximate solution is also found as well as the upper limit for residual moires. The proximity of the two solutions is proven. Experiments confirm the theoretical findings. The results can be used for minimizing moires in display devices which include several layers of regular grids.

Multiview Image Acquisition and Projection

A solution for describing both the multiview image set, obtained with a parallel camera layout, and the perceived image in a projection-type full parallax multiview imaging system with a parallel projector layout, is derived. This is done with the use of 4times4 homogenous matrices to quantitatively analyze the image quality in the system. The solution provides a means of finding properties and/or behavior of the perceived image changes depending on the viewers position in the system. The solution can analytically describe the appearance of three-dimensional images in the space generated by the multiview image set displayed on a projection screen

Three-dimensional imaging system based on a light-emitting diode array

A two-dimensional light-emitting diode array is used to replace the viewing-zone-forming optics in-multiview full-parallax three-dimensional image display systems. Since the array is not working merely as the viewing-zone-forming optics but also as the backlight panel for the liquid-crystal display (LCD) panel, it allows constructing three-dimensional imaging systems having the same structure as the current LCD display. The designed system displays images with good depth sense.

Stereo photography with hand phone

A mobile phone (Hand Phone) is designed to display stereo images taken from a camera attached to it. Software of processing a stereo image pair to be displayed on the display panel of the phone is developed and a detachable viewing zone forming optics is installed for the stereoscopic image generation without moires. Since the phone is operating only in the palm of the phones owner, special cares needed in photographing the image pair are described.

Layouts and Cells in Integral Photography and Point Light Source Model

The similarity between two groups of displaying methods is demonstrated in two ways, analytically and experimentally. A variety of layouts of the integral photography and display devices based on the point light source model is classified and analyzed in terms of projections and common/separate image planes. In particularly, the transformation matrix is found. Simulation experiments based on the image processing were performed. The layouts, analytical formulas, and experimental results show the similarity of both groups for several layouts.

Quality estimation for visual image in autostereoscopic 3D display

The quality of visual image in an autostereoscopic 3D display was found for case of multiple observer regions. This was made in the projective coordinates for which the forward and backward transformation matrices were found. It was demonstrated that the quality is kept along the nodal lines in all regions as well as between them. The distinctive locations were found together with the exact values of the quality function in these points. This allows estimating the behavior of the quality function for bigger number of views and image cells as well as across the longer and wider area.

Image and observer regions in 3d displays

Abstract The relation between light sources and screen cells is considered part of the theoretical model of an autostereoscopic 3D display. The geometry of the image and observer regions is presented, including the cases of single and multiple regions. The characteristic function is introduced. Formulas for the geometric parameters are obtained, including areas and angles. Special attention is drawn to the screen location. The method of transforming the formulas between regions is stated. For multiple regions, geometric dissimilarity was found. This allows the model to be applied in finding the geometric characteristics of multiview and integral‐imaging 3D displays.

Viewing Zones in PLS Based Multiview 3-D Imaging Systems

In 3D imaging systems, with a point light source (PLC) array as a backlight illumination and viewing zone forming, the finite size of the light-emitting surface of each PLC in the array and mismatch between the array period and pixel cell pitch limits the region of individual view image to a small portion of the viewing zone cross section (VZCS). The portion becomes smaller as the size approaches that of a pixel for an individual view image in the pixel cell, and/or the fractional size of the pixel becomes smaller. As a consequence, the VZCS becomes filled with viewing regions for mixed images of two adjacent view images. Hence, the effective number of different images which can be viewed at VZCS could be increased around two times that of the total different view images displayed on the display panel.

Conditions for Moire Free Contact-Type 3 Dimensional Displays

The superposing angle of the viewing zone forming optics and the display panel in the contact type 3 dimensional imaging systems for minimizing